(19)
(11) EP 1 324 332 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.09.2010 Bulletin 2010/35

(43) Date of publication A2:
02.07.2003 Bulletin 2003/27

(21) Application number: 03007767.1

(22) Date of filing: 18.03.1997
(51) International Patent Classification (IPC): 
G11B 20/00(2006.01)
 G11B 19/04(2006.01)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 21.10.1996 JP 27846696

(62) Application number of the earlier application in accordance with Art. 76 EPC:
97104639.6 / 0837470

(71) Applicant: FUJITSU LIMITED
Kawasaki-shi, Kanagawa 211-8588 (JP)

(72) Inventors:
  • Moribe, Mineo, c/oFujitsu Limited
    Kawasaki-shi, Kanagawa 211-8588 (JP)
  • Utsumi, Kenichi, c/oFujitsu Limited
    Kawasaki-shi, Kanagawa 211-8588 (JP)
  • Nagashima, Zenichi, c/oFujitsu Limited
    Kawasaki-shi, Kanagawa 211-8588 (JP)
  • Kobayashi, Hiroyuki, c/oFujitsu Limited
    Kawasaki-shi, Kanagawa 211-8588 (JP)
  • Murakami, Keijchi, Fujitsu Limited
    Kawasaki-shi, Kanagawa 211-8588 (JP)

(74) Representative: Körfer, Thomas et al
Mitscherlich & Partner Patent- und Rechtsanwälte Postfach 33 06 09
80066 München
80066 München (DE)

   


(54) Information recording medium an reproducing method, truth judging method for the same, and recording/reproducing apparatus for the same


(57) An information recording medium wherein the key information (1) is recorded by arrangement of a unit area (1a) recorded irreversibly and a unit area (1b) not recorded irreversibly to effect the truth judgment of the medium in accordance with the result of whether or not the reproduction of the key information (1) can be effected, the information recording medium where the illegal usage of the medium is adapted to be prevented without inputting the information on the medium truth judgment into the processing apparatus by provision of the medium firm information (4), a reproducing method for the same, a truth judging method for the same, and a recording/reproducing apparatus for the same.







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